Herein this work, we have used the sol-gel chemical synthesis method to prepare spherical shaped MgFe₂O₄ nanoparticles having size 45–50 nm. Using 1 mol L⁻¹ Sodium Perchlorate (NaClO₄) electrolyte, a capacitance of 61 F/g, a capacitance retention of 82.91% (after undergoing 1000 cycles), and an energy density of 41 Wh/kg have been achieved. Using 1 mol L⁻¹ Magnesium Perchlorate (Mg(ClO₄)₂) as electrolyte, a capacitance of 43 F/g, a capacitance retention of 82.15%, and an energy density of 29 Wh/kg have been realized. Furthermore, MgFe₂O₄ nanospheres exhibited an overpotential (η) = 1.09 V, a Tafel slope (b) = 317 mV/dec in regard to alkaline Oxygen Evolution Reaction (OER) electrocatalyst. It also achieved η = 402 mV and b = 241 mV/dec in regard towards alkaline Hydrogen Evolution Reaction (HER) electrocatalyst. These results signify the suitability of MgFe₂O₄ nanoparticles for high energy density aqueous supercapacitor and water splitting electrocatalyst applications.

在本文中，我们使用溶胶-凝胶化学合成方法制备了球形MgFe ₂ O ₄球形纳米颗粒，尺寸为45-50 nm。使用1mol L ^-1高氯酸钠（NaClO ₄）电解质，电容为61 F / g，电容保持率为82.91％（经过1000次循环后），能量密度为41 Wh / kg。使用1mol L ^-1高氯酸镁（Mg（ClO ₄）₂）作为电解质，已经实现了43 F / g的电容，82.15％的电容保持率和29 Wh / kg的能量密度。此外，MgFe ₂ O ₄纳米球表现出相对于碱性氧发生反应（OER）电催化剂的超电势（η）= 1.09 V，Tafel斜率（b）= 317 mV / dec。就碱性氢析出反应（HER）电催化剂而言，它也达到η= 402 mV和b = 241 mV / dec。这些结果表明，MgFe ₂ O ₄纳米粒子适用于高能量密度水性超级电容器和水分解电催化剂应用。